Electrostatic power painting head

Abstract

An electrostatic powder painting gun head in which a needle electrode is provided at a central portion in the proximity of a cylindrical powder ejection port made of insulator, an annular strip electrode is disposed outside of the powder ejection port, also a gas injection port for forming a gas flow layer along the surface of the annular strip electrode is provided, and further there is provided a high voltage power supply for applying a predetermined voltage between the needle electrode and the annular strip electrode. Powder ejected from the powder ejection port can be surely charged by making all the ejected powder cross with a monopolar corona discharge current flowing from the needle electrode towards the annular strip electrode, the powder can be deposited even onto a concave portion of a body to be painted without generating a Faraday cage effect, and also accumulation of charged powder paint particles onto the surface of the annular strip electrode disposed outside of the powder ejection port can be prevented.

Dependencies are inferred from the claim text.